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Segment Reporting (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income | $ 115,457 | $ 99,439 | $ 92,389 | $ 89,240 | $ 93,262 | $ 90,017 | $ 79,603 | $ 74,015 | $ 396,525 | $ 336,897 | $ 300,991
Provision for loan losses | 1,000 | 2,250 | 1,810 | 1,750 | 2,150 | 2,150 | 1,750 | 1,500 | 6,810 | 7,550 | 7,530
Noninterest income | 36,374 | 38,053 | 35,581 | 33,953 | 32,441 | 33,413 | 34,265 | 32,021 | 143,961 | 132,140 | 137,415
Noninterest expense | 93,313 | 94,746 | 79,026 | 77,944 | 76,808 | 80,660 | 74,841 | 69,309 | 345,029 | 301,618 | 295,099
Income before income taxes | 57,518 | 40,496 | 47,134 | 43,499 | 46,745 | 40,620 | 37,277 | 35,227 | 188,647 | 159,869 | 135,777
Income taxes | 13,098 | 8,532 | 10,424 | 9,673 | 30,234 | 14,199 | 11,993 | 11,255 | 41,727 | 67,681 | 44,847
Net income | 44,420 | $ 31,964 | $ 36,710 | $ 33,826 | 16,511 | $ 26,421 | $ 25,284 | $ 23,972 | 146,920 | 92,188 | 90,930
Total assets | 12,934,878 |  |  |  | 9,829,981 |  |  |  | 12,934,878 | 9,829,981 | 8,699,851
Goodwill | 932,928 |  |  |  | 611,046 |  |  |  | 932,928 | 611,046 | 470,534
Community Banks |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill | 930,161 |  |  |  | 608,279 |  |  |  | 930,161 | 608,279 | 467,767
Insurance |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill | 2,767 |  |  |  | 2,767 |  |  |  | 2,767 | 2,767 | 2,767
Operating Segments | Community Banks |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  |  |  | 406,420 | 344,499 | 305,583
Provision for loan losses |  |  |  |  |  |  |  |  | 6,810 | 7,550 | 7,530
Noninterest income |  |  |  |  |  |  |  |  | 120,559 | 110,308 | 114,615
Noninterest expense |  |  |  |  |  |  |  |  | 323,439 | 281,698 | 276,260
Income before income taxes |  |  |  |  |  |  |  |  | 196,730 | 165,559 | 136,408
Income taxes |  |  |  |  |  |  |  |  | 44,464 | 70,257 | 46,352
Net income |  |  |  |  |  |  |  |  | 152,266 | 95,302 | 90,056
Total assets | 12,828,586 |  |  |  | 9,717,779 |  |  |  | 12,828,586 | 9,717,779 | 8,602,022
Goodwill | 930,161 |  |  |  | 608,279 |  |  |  | 930,161 | 608,279 | 467,767
Operating Segments | Insurance |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  |  |  | 484 | 457 | 350
Provision for loan losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Noninterest income |  |  |  |  |  |  |  |  | 9,831 | 9,530 | 10,074
Noninterest expense |  |  |  |  |  |  |  |  | 7,294 | 6,957 | 6,873
Income before income taxes |  |  |  |  |  |  |  |  | 3,021 | 3,030 | 3,551
Income taxes |  |  |  |  |  |  |  |  | 786 | 1,184 | 1,385
Net income |  |  |  |  |  |  |  |  | 2,235 | 1,846 | 2,166
Total assets | 25,798 |  |  |  | 26,470 |  |  |  | 25,798 | 26,470 | 23,693
Goodwill | 2,767 |  |  |  | 2,767 |  |  |  | 2,767 | 2,767 | 2,767
Operating Segments | Wealth Management |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  |  |  | 1,297 | 2,160 | 1,846
Provision for loan losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Noninterest income |  |  |  |  |  |  |  |  | 14,537 | 12,863 | 12,354
Noninterest expense |  |  |  |  |  |  |  |  | 13,336 | 11,785 | 11,099
Income before income taxes |  |  |  |  |  |  |  |  | 2,498 | 3,238 | 3,101
Income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income |  |  |  |  |  |  |  |  | 2,498 | 3,238 | 3,101
Total assets | 60,794 |  |  |  | 61,330 |  |  |  | 60,794 | 61,330 | 54,857
Goodwill | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  |  |  | (11,676) | (10,219) | (6,788)
Provision for loan losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Noninterest income |  |  |  |  |  |  |  |  | (966) | (561) | 372
Noninterest expense |  |  |  |  |  |  |  |  | 960 | 1,178 | 867
Income before income taxes |  |  |  |  |  |  |  |  | (13,602) | (11,958) | (7,283)
Income taxes |  |  |  |  |  |  |  |  | (3,523) | (3,760) | (2,890)
Net income |  |  |  |  |  |  |  |  | (10,079) | (8,198) | (4,393)
Total assets | 19,700 |  |  |  | 24,402 |  |  |  | 19,700 | 24,402 | 19,279
Goodwill | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 | $ 0

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